You know "We need money".
Of course they need money. They are a business and not a charity.
They maintain the DCS World basis and therfor they need money to pay the salaries for the people maintaing this basis. You can definitely say and mourn about wrong decision they make/made with the planes they release or the maps. Or the lack of "gaming" features to make the sim more immersive and all of that. But for me it is reasonable that they charge us some money for new content. And its also normal that old tech gets superseeded with new tech. Or do you complain that you can't use your C64 tape storage unit with your new IMac?
in the "old" days you had a new sim every time Jane's decided to release new planes/maps. And you also can't merge these games into one playfield. And also they charged every time the full amount of money and don't get old users some sort of discount. Was this really better than we have today?